Casio PX-330 - Manual (Page 33)

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17 Parameter Transfer
There are two parameter operations: Individual Parameter Transfer and Individual Parameter Request.
A single session is concluded only when this Instrument returns an IPS (Individual Parameter Send) in response to an
IPR (Individual Parameter Request) from an external device, or when an external device or this Instrument spontaneously
sends an IPS. If this Instrument received an IPS, the value of the applicable parameter is changed.
Depending on the function of a parameter, Individual Parameter Send may be used to issue a command to the Instrument
or Individual Parameter Request may be used to check Instrument status information.
17.1 Two-way Communication
17.1.1 Example : Data send in response to send request to the Instrument
17.2 One-way Communication
17.2.1 Example : Data send to Instrument from external source
17.2.2 Example : Data send resulting from Instrument operation
Data Receiver Data Sender Operation
IPR  Send Request
 IPS Data Transfer
Data Sender Data Receiver Operation
 IPS Data Transfer
Data Receiver Data Sender Operation
 IPS Data Transfer